报错如下：
![fallback method wasn‘t found: fallback_functions([class java.lang.XXX])](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpNMk9DOWtOemsxT0dJeU5HUTBNalk0TmpjMU9EVXpNMlV3WVRVelpHSmpOVE5rTUM1d2JtYz0= "fallback method wasn‘t found: fallback_functions([class java.lang.XXX])")
在使用hystrix熔断器的时候出现这个问题，明明指定了对应的fallbackMethod却说找不到，代码如下：
![fallback method wasn‘t found: fallback_functions([class java.lang.XXX])](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjMk1TODFaVGMyTjJJNVlUSXpPREJsTm1ZeVlXUTNZV016WmpZMVltUTBOVEEwT1M1d2JtYz0= "fallback method wasn‘t found: fallback_functions([class java.lang.XXX])")
原因：fallback_functions与testBreaker的入参必须保持一致！不能说熔断的回调方法不需要参数就不给！
![fallback method wasn‘t found: fallback_functions([class java.lang.XXX])](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpnNE9DODFNVFkzWlRNMU5EazVOREExWmpOaVl6RXpOVGt5TURVMU1UVmhZVGt3TUM1d2JtYz0= "fallback method wasn‘t found: fallback_functions([class java.lang.XXX])")
解决：
![fallback method wasn‘t found: fallback_functions([class java.lang.XXX])](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpFMU1pOWhNekZpWW1VMU9HTmlNakJtT0RRNFpUZ3dObUprWlRsbU1HWTRaalE1T0M1d2JtYz0= "fallback method wasn‘t found: fallback_functions([class java.lang.XXX])")
![fallback method wasn‘t found: fallback_functions([class java.lang.XXX])](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpJeU1TODJOak5oTXprM1pEa3daVEl4TkdOak5qSTNZbVkwTlRRNU1UaGxOVEF4WkM1d2JtYz0= "fallback method wasn‘t found: fallback_functions([class java.lang.XXX])")
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